"...a short film written and directed by Roman Polanski in 1957. According to Roman Polanski's autobiography, the film was a stunt which nearly got him thrown out of Lodz film school; Polanski had organized a groups of "Thugs" to go to a school dance and begin disrupting it. As the band played "When the Saints Go Marching In," some students were actually beaten up. The ironic alternate title is "Break Up the Dance"."
Other R. Polanski short films...
"Mammals" ["Ssaki"] 
"The Fat and the Lean" ["Le Gros et le Maigre"]